The material shall consist of technical lambda-cyhalothrin, complying with the requirements of WHO specification 463/TC (2003), dissolved in suitable solvents together with any other necessary formulants. It shall be in the form of a clear to slightly hazy, stable homogeneous liquid, free from visible suspended matter and sediment, to be applied as an emulsion after dilution with water.

PH Range

6.0 to 8.0

Persistent foam

There shall be a maximum of 15 ml after 1 minute.

Emulsion stability and re-emulsification

The formulation when diluted at 30 ± 20C with CIPAC Standard Waters A and D, shall comply with the following:

Time after dilution

Limits of stability

0 h

Initial emulsification complete

0.5 h

‘Cream’, maximum: 1 ml

2.0 h

‘Cream’, maximum: 2 ml

Free oil

maximum trace

24 h

Re-emulsification complete

24.5 h

‘Free oil’, maximum: 2 ml

Free oil

maximum trace

Storage stability

Stability at 0 °C

After storage at 0 ± 2°C for 7 days, the volume of solid or liquid which separates shall not be more than 0.3 ml.

Stability at elevated temperature

After storage at 54 ± 2°C for 14 days, the determined average active ingredient content shall not be lower than 95%, relative to the determined average content before storage and the formulation shall continue to comply with the clauses for pH range and emulsion stability and re-emulsification.